\section{符号说明}
\begin{table}[!htbp]
	\centering
	\resizebox{\textwidth}{!}{
		\begin{tabular}{cc}
			\toprule[1.5pt]
			\makebox[0.4\textwidth]{符号} & \makebox[0.5\textwidth]{含义} \\
			\midrule
			$\delta_{ij}$ & Kronecker 符号 \\
			$\min_S$ & 条件$S$下最小值 \\
			$\max_S$ & 条件$S$下最大值\\
			$\widehat{\cdot}$ & 除去这一项 \\
			$R^2$ & 拟合优度\\
			\bottomrule[1.5pt]
		\end{tabular}
	}
\end{table}